# Rebuilt Automatic Transmission problem

**URL:** <https://boards.straightdope.com/t/rebuilt-automatic-transmission-problem/143664>\
**Category:** Factual Questions\
**Created:** [December 18, 2002, 10:10pm UTC](https://boards.straightdope.com/t/rebuilt-automatic-transmission-problem/143664 "2002-12-18T22:10:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![simple\_homer](https://avatars.discourse-cdn.com/v4/letter/s/9de0a6/32.png) [@simple\_homer](https://boards.straightdope.com/u/simple_homer)\
**Post date:** [December 18, 2002, 10:10pm UTC](https://boards.straightdope.com/t/rebuilt-automatic-transmission-problem/143664/1 "2002-12-18T22:10:12Z")

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I have a 1994 Mercury Grand Marquis with I believe to be the AOD-E transmission. The transmission failed completely, and I had a transmission shop rebuild it for me. Twice I have gotten the car back, and it would drive okay for a few days, and then would start to act up. Either going from park to drive, or while stopped at a light (in drive) ,it will seem to be in neutral for a few seconds, and then will slam into gear after i give it a little gas.  
They have had it apart at least 3 times now, and I am curious as to what is going on. Obviously, they are missing something, and they are redoing it under warranty, but I am getting tired of their not being able to repair it properly. Can anyone in the automotive field clue me into what they are doing or not doing properly?

Thanks

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**Author:** ![zwede](https://avatars.discourse-cdn.com/v4/letter/z/ac91a4/32.png) [@zwede](https://boards.straightdope.com/u/zwede)\
**Post date:** [December 19, 2002, 8:56am UTC](https://boards.straightdope.com/t/rebuilt-automatic-transmission-problem/143664/2 "2002-12-19T08:56:43Z")

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It is of course very difficult to diagnose something like this over the net, but I have some ideas…

The gears are engaged using hydraulic pressure. Where the hydraulic pressure goes is controlled by what is called the valvebody. With your tranny being a -E, it means it has an electronically controlled valvebody.

So I can see it being either a hydraulically related problem, or electronic.

Hydraulic problem could be a blocked passage, a faulty valve, or a bad pump. Reving the engine will increase the hydraulic pressure which could make a valve move to the correct position, or overcome a partial blockage.

Electronic problem could be the actual computer controlling the transmission, the wiring harness or the electric solenoids located inside the transmission which direct the fluid.

/Markus